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GPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on harder queries, improving accuracy on math, coding, and multi-step tasks without slowing down typical conversations. The model is warmer and more conversational by default, with better instruction following and more stable short-form reasoning. GPT-5.1 Chat is designed for high-throughput, interactive workloads where responsiveness and consistency matter more than deep deliberation.
Price/1M
$3.44
571st cheapest
1009% above median
Top 85%
Context Window
128K
225th largest
Top 75%
Input
$1.25
per 1M tokens
Output
$10.00
per 1M tokens
Blended
$3.44
per 1M tokens
Cheaper than 15% of models. Median price is $0.31/1M tokens.
Daily
$3.44
Monthly
$103.13
Context Window
128K
tokens
Larger than 25% of models
Max Output
16K
tokens
13% of context
Context Window Comparison